Fastener for installation tool for roof truss framing and construction system

Abstract

An installation tool fastener is particularly adapted for fastening a top plate to a roof support member and other structural connections and is particularly adapted for use with an installation tool. The installation tool fastener has a head with a maximum head diameter and a recess for coupling with a drive coupler. The shank of the head has an unthreaded portion and a uniform thread which has a major diameter approximately equal to the maximum diameter of the head. The head preferably has a slight taper. The thread preferably has a 7.5 thread per inch pitch and a thread angle from approximately 25° to 45°. In one embodiment for a 6 inch fastener, the thread length is approximately 5 inches and extends along the tapered distal tip.

The invention claimed is: 
     
       1. A fastener for an installation tool comprising:
 a head portion defining a recess for coupling with a driving tool and having a maximum head diameter; 
 an elongated shank longitudinally extending from said head portion and terminating in a tapered tip; and 
 a helical thread longitudinally extending along said shank and having a minor diameter and a major diameter substantially equal to said maximum head diameter, 
 wherein said fastener has a length and the length is greater than 15 times the maximum head diameter and the major diameter is no greater than 1.75 times the minor diameter. 
 
     
     
       2. The installation tool fastener of  claim 1  wherein said fastener has a longitudinal length of approximately 6.00 inches. 
     
     
       3. The installation tool fastener of  claim 1  wherein said helical thread has a pitch of 7.5 threads per inch. 
     
     
       4. The installation tool fastener of  claim 1  wherein said helical thread extends onto said tapered tip. 
     
     
       5. The installation tool fastener of  claim 1  wherein said major diameter and said maximum head diameter are each approximately 0.26 inches. 
     
     
       6. The installation tool fastener of  claim 1  wherein said shank has an unthreaded portion adjacent said head. 
     
     
       7. The installation tool fastener of  claim 6  wherein said helical thread extends approximately 5.00 inches. 
     
     
       8. The installation tool fastener of  claim 1  wherein said head portion has a slight taper of approximately 4° from a maximum diameter portion adjacent an engagement end. 
     
     
       9. The installation tool fastener of  claim 1  wherein said recess is selected from a group consisting of a socket with a plurality of radial portions, a Philips socket and a square socket. 
     
     
       10. The installation tool fastener of  claim 1  wherein said threaded portion has a length greater than 10 times the major diameter. 
     
     
       11. A fastener for an installation tool comprising:
 a head portion defining a recess for coupling with a driving tool and having a first coupling end with a maximum head diameter and uniformly tapering toward a second end at an acute angle; 
 an elongated shank longitudinally extending from said head portion and terminating in a tapered tip and having a threaded portion and an unthreaded portion adjacent said second end; and 
 a thread longitudinally extending along said shank onto said tapered tip and having a major diameter substantially equal to said maximum head diameter and said thread having a minor diameter along said shank, 
 wherein the fastener has a length and the length is greater than 15 times said maximum head diameter and the major diameter is no greater than 1.75 times the minor diameter. 
 
     
     
       12. The installation tool fastener of  claim 11  wherein said fastener has a longitudinal length of approximately 6 inches and said thread extends approximately 5 inches. 
     
     
       13. The installation tool fastener of  claim 11  wherein said helical thread has a pitch of 7.5 threads per inch. 
     
     
       14. The installation tool fastener of  claim 11  wherein said major diameter and said maximum head diameter are each approximately 0.26 inches. 
     
     
       15. The installation tool fastener of  claim 11  wherein said acute angle is approximately 4°. 
     
     
       16. The installation tool fastener of  claim 11  wherein said recess is selected from a group consisting of a socket with a plurality of radial portions, a Philips socket and a square socket. 
     
     
       17. The installation tool fastener of  claim 11  wherein said threaded portion has a length greater than 10 times the major diameter.